Formation of Photoluminescent Lead Bromide Nanoparticles on Aluminoborosilicate Glass
authors Ruivo, A; Andrade, SM; Rocha, J; Laia, CAT; Pina, F
nationality International
journal JOURNAL OF PHYSICAL CHEMISTRY C
keywords HALIDE PHOTOCHROMIC-GLASSES; SILICATE-GLASSES; ELECTRON-TRANSFER; BORATE GLASSES; RAMAN; LUMINESCENCE; MELTS; MECHANISM; SPECTROSCOPY; CRYSTALS
abstract A multicomponent aluminoborosilicate photoluminescent glass was synthesized by introducing Pb(II) and NaBr in its composition. The room-temperature photoluminescence is due to the existence of 4 nm nanocrystals, shown using TEM imaging and XRD analysis, which are assigned to PbBr2 nanocrystals. The glasses display a broad emission band with a peak at 2.85 eV by exciting at 3.35 eV, with an anisotropy equal to 0.19 at room temperature. At 77 K, the emission intensity increases 1 order of magnitude and a vibronic structure appears, indicating an electron-phonon coupling with the glass matrix. Time-resolved luminescence measurements of these nanocrystals reveal mixed-order kinetics, with second-order recombination of self-trapped electron centers and a first-order temperature-dependent nonradiative rate constant connected with pathways due to confinement of self-trapped centers.
publisher AMER CHEMICAL SOC
issn 1932-7447
year published 2014
volume 118
issue 23
beginning page 12436
ending page 12442
digital object identifier (doi) 10.1021/jp5003758
web of science category Chemistry, Physical; Nanoscience & Nanotechnology; Materials Science, Multidisciplinary
subject category Chemistry; Science & Technology - Other Topics; Materials Science
unique article identifier WOS:000337497400039
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